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Fencer Vulns
high 7.5

CVE-2016-7952 json

X.org libXtst before 1.2.3 allows remote X servers to cause a denial of service (infinite loop) via a reply in the (1) XRecordStartOfData,…

published 2016-12-13 9 y ago modified 2026-06-17 4 mo ago also EUVD-2016-8801

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.3%
EPSS 2.3% chance of exploitation in 30 days, percentile 83%
public exploits
0
none known

Summary

X.org libXtst before 1.2.3 allows remote X servers to cause a denial of service (infinite loop) via a reply in the (1) XRecordStartOfData, (2) XRecordEndOfData, or (3) XRecordClientDied category without a client sequence and with attached data.

Patch / fix

  • libxtst Debian 14, Debian 13, Debian 12 2:1.2.3-1

debian advisories DEBIAN-CVE-2016-7952

  • libxtst Ubuntu 20.04 LTS, Ubuntu 18.04 LTS 2:1.2.3-1
  • libxtst Ubuntu Pro 16.04 LTS 2:1.2.2-1ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2016-7952

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • xorg-x11-libs SLES for SAP 11 SP4, SLES 11 SP4, SLE Software Development Kit 11 SP4 7.4-8.26.49.1
  • libXi SLES for SAP 12 SP2, SLES for Raspberry Pi 12 SP2, SLES 12 SP2 +2 more 1.7.4-14.1
  • libXv SLES for SAP 12 SP2, SLES for Raspberry Pi 12 SP2, SLES 12 SP2 +2 more 1.0.10-7.1
  • libX11 SLES for SAP 12 SP2, SLES for Raspberry Pi 12 SP2, SLES 12 SP2 +2 more 1.6.2-8.1
  • libXtst SLES for SAP 12 SP2, SLES for Raspberry Pi 12 SP2, SLES 12 SP2 +2 more 1.2.2-7.1
  • libXvMC SLES for SAP 12 SP2, SLES for Raspberry Pi 12 SP2, SLES 12 SP2 +2 more 1.0.8-7.1
  • libXfixes SLES for SAP 12 SP2, SLES for Raspberry Pi 12 SP2, SLES 12 SP2 +2 more 5.0.1-7.1
  • libXrender SLES for SAP 12 SP2, SLES for Raspberry Pi 12 SP2, SLES 12 SP2 +2 more 0.9.8-7.1

suse advisories SUSE-SU-2016:3189-1SUSE-SU-2016:2828-1SUSE-SU-2016:2505-1

  • libxtst Alpine 3.3, Alpine 3.2 1.2.2-r1

alpine advisories ALPINE-CVE-2016-7952

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2016-7952 updated cvss 5.0

libXtst: Insufficient validation of server responses result in various data mishandlings

  • Red Hat Enterprise Linux 5 libXtst Red Hat Enterprise Linux 6 libXtst Red Hat Enterprise Linux 7 libXtst
    affected: no fix planned “Will not fix”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.29% chance of exploitation in the next 30 days, higher than 83% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness
  • CWE-20 Improper Input Validation
  • CWE-284 Improper Access Control

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.